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We have looked at adding DFL coatings to a few high wear parts. It requires that we lightly blast the materials with Al02 before coating. The main component in DFLs is Moly (same think in oil!) Just curious if these coatings are a marketing scam? I really do not want to waste my time and...

No at all. We are open to ideas here but carburizing seemed the best solution at the time.. If we could find something that would induction harden to our specs, that could work too. No one locally does nitriding. We were pretty fixed on just using 8620 and taking them in to be carburized but...

Ironically, last time I quotes with Alro, they could only offer cut plate which would cost much more than bar. I will chech with them again. If we cannot get 8620, we were looking at pack carburizing something like a 4320 or maybe 4340. We planned to slow cool so as not to harden the part...

The part varies greatly in cross section. We would start with a 1x2x3 block and machine 65% of it away. Fork tips are thin but the back of the part remains 1" wide x .75" squared. This should keep the bulk of the part from trying to through harden but I am worried that trying to case harden a...

Here is the deal. We had pretty much settled on 8620 and then carburize it. Then we found out that 8620 is pretty much non-existent in flats. So now we are back to the drawing board... The part needs to be through hardened to around HRC 35 depending on alloy. The fork tips need to achieve...

No, our goal is to have the parts on the machine 1 time. We can certainly adjust our process to adjust for HT variance in size and slight part distortion from HT will not be an issue. Only maintaining the OD size. If we can tumble and remove the scale or keep it from forming, we are good. We...

I would also add that we can certainly tumble these parts if that will remove the scale left on the 4140 parts from HT. In our experience, with the right media will not remove an appreciable amount of OD material to worry about. The scale is our only concern...

We are making a simple shaft with a bearing tolerance OD to +/- .0002" We want to keep the entire part in house because pricing is a concern. We are looking very hard at 17-4PH H900 but it is only HRC 38-42 and we really need to be around HRC 50. The shaft is roughly 7/16 diam and 3" long. I...

I have not done any math as of yet but do you think a basic 6-8kw residential type kiln could work for smaller runs? Even if we cannot make this case harden deal work, I would still like to bring our smaller run 4XXX series jobs in for through hardening. I am guessing though that we will...

LOL, wouldn't you know it. We DO brew our own in 10gal batches!! Have been for about 3 yrs now. And to think we are just throwing away our mash mixture when we are done... Can you guys offer any US sources for pack or liquid carburizing by chance?

Per my other threads, we want to bring a carburize process in house for small volume work. Per our research, the ONLY one that seems safe enough to bring in is pack carbing by cooking the parts in a carbon rich powder and then either removing quickly for quenching in water or allowing to slow...

Our original material selection was 4340 but learned that it is prone to through hardening which would cause problems in this application. Our material selection is being driven by the structural properties. Quite honestly, we are very open to other material selections but it seems that we can...

I will admit that our documentation here is limited but in our research, the nitriding will create a thinner surface layer but with our targeted .010" thickness, it should not be an issue for nitriding our 1 in3 part. maybe I am missing something on the subject.

The part is an automotive shift fork. We are not opposed at all to carburizing but the techniques involve using a carbon rich gas (Methane) that is highly flammable thus my reluctance to use it. Obviously it would be the cheapest route by far. gas nitriding was also appealing because it...

We are wanting to bring a case hardening process in house for some parts we are making. We are primarily looking at 8620 as the material. These are auto transmission parts. We would like to buy the material in the pre-hard condition (125ksi), machine the parts, then apply a surface hardening...

Thanks, I think we would like to through harden to about HRC28-32 at this time, then do a case harden to max hardness for wear protection. We really want to keep the HT in house to reduce costs and lead times. Is there a process that can yield more than HRC60 in 4340 and is there a process...

Terry, that is super information. Upon careful discussion, we have strongly looked at 4340 and 8620 but to be honest, the 8620 is a metal we have never cut or messed with. The decision of how to heat treat us still in the air but we have plenty of experience with 4140HT but really trying to...

The coating we will apply contains 10% Molybdenum and will apply at approx .001" thick. Our thought was to use 4340 and through harden to approx HRC58-60, then apply our anti-wear coating. I still cannot get much from the coating people to figure out if this coating can be substituted for a...

We are working on a shift fork for a transmission. The OE part is an unknown steel alloy. Have not got everything tested yet but seems to be around RC35-38 and the shift paws that have all the sliding friction seem to have some type of hard silver coat on them that is around RC65. I grinded...

Thanks for the reply. What we have found in our discussions is my target 4Mhz is a bit on the high side and we probably would never need to step past 200Khz. I am certainly open to other solutions for a logging scope. I will admit I have some stick shock on some NI boards. Really would...